Abstract: The investigation of one-year-old Avicennia marina seedlings cultivated in sand beds irrigated with natural sea-water indicates that some quantitative indices such as plant height, basal diameter, root length, pneumatophore height and leaf area and weights of root, stem, branch,leaf, viviparous seedlings and whole plant show a pattern of their arithmetic mean> median>median of mode interval, which accords with poSitive deviate distribution. The arithmetic mean of some enumerative indices Such as numbers of node, leaf, pneumatophore and viviparous seedling of anllual seedling equals to their median. both of which are equal to or larger than the median of mode intervals. It also shows that annual Avicennia marina seedlings can grow the pneumatophores. flower and fruit, and propuced viviparous seedlings which after maturation,can directly develop into new seedlings. Based on the data obtained, 30 regressive models on the morphological factors and hiomass of annual A. marina sablings are built up using linear,multilinear and non-linear regression.

Key words: Avicennia marina, Seedling, Morphological character, Biomass Regressive model, CDOM, Erlonghu Reservoir, East Liaohe River, absorption characteristics, particulate matter